JP4649373B2 - Pavement removal method and grinding machine used therefor - Google Patents

Description

  The present invention relates to a method for removing a pavement formed by sequentially laminating an adhesive layer and a mixture layer on a floor slab, and a grinding machine used therefor.

Conventionally, when asphalt pavement is constructed on a floor slab such as an elevated road or a bridge, in order to attach and integrate the floor slab and the pavement, an adhesive is first applied on the floor slab. And an asphalt mixture layer is applied thereon. When such asphalt pavement is cracked or rubbed, repair is required, and when removing existing asphalt pavement, the following method has been used.
(1) The surface asphalt mixture layer is peeled off with a ripper attached to a backhoe or the like and removed.
(2) The remaining asphalt mixture layer is manually removed using an electric pick or the like.
(3) The adhesive layer is removed by human power.

  On the other hand, grinding machines are known for removing paints (such as vinyl chloride paint films, urethane paint films, dustproof paints, etc.) applied to concrete structures and asphalt pavements and grinding concrete surfaces themselves. For example, a grinding machine described in Patent Document 1 includes a grinding member that rotates about a vertical axis and grinds paint on a floor surface on the lower side of a vehicle body.

JP 2000-314106 A (paragraphs 0019 to 0020, FIG. 1)

  In the conventional asphalt pavement removal method, since the adhesive layer is removed by means of human-powered keren, the burden on the worker is heavy and much labor is required. In addition, depending on the level of proficiency of the worker, the keren work may take time, and it is difficult to plan an accurate work time.

  Further, since an adhesive having a high viscosity is used for the adhesive layer of the floor slab to follow the deflection of the floor slab, when the above-described grinder is used for the adhesive layer removing operation, the peeled adhesive layer ( There was a problem that the adhesive) was adhered to the grinding member and the grinding ability was significantly reduced. Moreover, since the grinding machine is a device for grinding by rotating a grinding member, there is a problem that the peeled adhesive layer is scattered and adheres to the floor slab again. Therefore, it has been difficult to use a grinder to remove the adhesive layer attached to the floor slab.

  The present invention has been made in view of such a problem, and it is an object of the present invention to provide a method for removing a pavement capable of improving work efficiency while attaining work mechanization and a grinder used therefor. .

  The present invention is a method for removing a pavement formed by laminating an adhesive layer and a mixture layer in this order on a floor slab, a step of removing the mixture layer, a step of spraying an adhesion preventing material on the adhesive layer, Grinding the adhesive layer on which the anti-adhesive material has been dispersed with a grinder.

According to this method, after removing the mixture layer, the adhesion preventing material is sprayed on the adhesive layer. Then, when the adhesion layer on which the adhesion preventing material is dispersed is ground by the grinder, the adhesion preventing material adheres to the peeled adhesion layer, so that the adhesion layer is prevented from adhering to the grinding machine. Moreover, since the adhesion preventing material adheres to the scattered adhesive layer, the scattered adhesive layer does not adhere to the floor slab again and can be easily removed.
The mixture layer refers to a layer composed of asphalt mixture including asphalt and aggregate, concrete including cement and aggregate, and the like.

  Moreover, it is preferable that the said adhesion prevention material is a granular or powdery material.

  Since the granular or powdery material suitably adheres to the adhesive layer, it is possible to prevent the peeled adhesive layer from reattaching to the grinding member or floor slab of the grinding machine. As the granular or powdery material, for example, stone powder, sand, slag, slaked lime, or a combination thereof may be used.

  The method for removing the pavement is particularly suitable when the adhesive layer is made of an asphalt adhesive.

If the adhesive layer is composed of an asphalt adhesive, the asphalt adhesive softens (thickens) due to the frictional heat of the grinding member of the grinding machine. According to the present invention, the adhesive layer adheres to the softened adhesive layer. Since the preventive material adheres, the adhesive layer does not adhere to the grinding machine.
Examples of asphalt adhesives include asphalt emulsions, rubber-containing asphalt emulsions, and solvent-type rubber asphalt adhesives.

  The grinding machine also includes a grinding member for grinding the adhesive layer, a rotating device for rotating the grinding member, a moving device for moving on the floor slab, and the adhesion preventing material is sprayed on the adhesive layer. It is good to set it as the structure provided with the adhesion prevention material spraying device to do.

  According to this method, the step of spraying the adhesion preventing material on the adhesive layer and the step of grinding the adhesive layer on which the adhesion preventing material is dispersed can be performed in parallel by the grinding machine. Therefore, the construction efficiency can be improved.

  Moreover, it is preferable that the floor slab is made of a steel slab and includes a step of blasting the steel slab after grinding the adhesive layer.

According to this method, the steel slab is blasted after the adhesive layer is ground by the grinding machine. Thereby, since rust etc. of a steel deck are removed neatly, integration of a new pavement and a steel deck can be aimed at suitably.
In addition, since it is necessary to perform this blasting in a dry state, for example, when the adhesive layer is removed by a water jet described in JP-A-2004-299042, the steel slab is dried. Although it is necessary to wait for the blasting process, according to the present invention, the adhesive layer can be removed in a dry state, so that the step of drying the steel deck can be omitted. Further, according to the present invention, the adhesive layer can be ground and removed without damaging the floor slab so much, so that it is particularly suitable when the floor slab is a steel slab.

  The present invention is a grinding machine used for removing a pavement formed by laminating an adhesive layer and a mixture layer in this order on a floor slab, a grinding member for grinding the adhesive layer, and a rotating device for rotating the grinding member; And a moving device for moving on the floor slab, and an anti-adhesive material spraying device for spraying an anti-adhesive material on the adhesive layer.

  According to this configuration, the grinding machine grinds the adhesive layer on which the adhesion preventing material has been dispersed with the grinding member while the adhesion preventing material is dispersed on the adhesive layer by the adhesion preventing material spraying device. Therefore, the adhesive layer peeled off from the floor slab does not adhere to the grinding member, and work efficiency can be maintained.

  The adhesion preventing material spraying device includes a storage unit that stores the adhesion preventing material, a spraying unit that sprays the stored adhesion preventing material, and a screw feeder that conveys the adhesion preventing material from the storage unit to the spraying unit. It is good to comprise.

  According to this configuration, the adhesion preventing material stored in the storage unit is quantitatively conveyed to the spraying unit by the screw feeder. Thereby, since an appropriate amount of adhesion preventing material is dispersed on the adhesive layer, it is possible to reliably prevent the peeled adhesive layer from adhering to the grinding member.

  According to the present invention, it is possible to prevent the adhesive layer that has been peeled off by spraying the adhesion preventing material on the adhesive layer from adhering to the grinding machine, so that the work can be mechanized and the work efficiency can be improved.

  Embodiments of the present invention will be described in detail with reference to the drawings. In this embodiment, a case where a steel floor slab is used as a floor slab and an asphalt pavement is used as a pavement will be described as an example. In the description, the same elements are denoted by the same reference numerals, and redundant description is omitted. In the following description, the right side of FIG. 2 is described as the front and the left side as the rear.

  First, the structure of the steel deck 10 and the asphalt pavement 20 will be described. Fig.1 (a) is sectional drawing of a steel deck and asphalt pavement, FIG.1 (b) is the elements on larger scale of the A section shown to Fig.1 (a).

  The steel deck 10 is a steel member constituting a bridge or a viaduct bridge girder, and is installed on an I-shaped main girder 11 and an upper part of the main girder 11 as shown in FIG. An upper plate 12, a bottom plate 13 installed on the lower end side of the main girder 11, a side plate 14 obliquely connecting the lower end side of the main girder 11 and the end of the upper plate 12, and a lower surface of the upper plate 12 It is comprised from the some rib 15,15 ... installed. The top plate 12, the bottom plate 13, and the side plate 14 are made of steel plates and are connected to the main girder 11 by welding or bolting. The rib 15 increases the rigidity of the upper plate 12, has a trapezoidal cross section, and is welded and fixed to the lower surface of the upper plate 12 at equal intervals.

  The asphalt pavement 20 is a pavement that covers the upper surface of the steel floor slab 10, and includes an adhesive layer 21 and an asphalt mixture layer 22 that is a mixture layer, as shown in FIGS. The asphalt mixture layer 22 has a two-layer structure of a base layer 22A and a surface layer 22B. The asphalt pavement 20 is configured by a pavement having a high deflection follow-up performance so that peeling, cracking, and the like do not occur due to the deflection of the steel deck 10. The adhesive layer 21 is made of, for example, a solvent-type rubber asphalt adhesive. The base layer 22A is made of, for example, a goose asphalt mixture having excellent water resistance and flexibility. The surface layer 22B is made of, for example, a modified asphalt mixture that is excellent in fluid resistance and wear resistance.

  In addition, if the asphalt pavement 20 is laminated | stacked in order of the contact bonding layer 21 and the asphalt mixture layer 22, another layer may interpose between them. For example, it goes without saying that a waterproof layer (not shown) may be provided between the adhesive layer 21 and the base layer 22A, and a tack coat layer may be provided between the base layer 22A and the surface layer 22B.

  Next, the grinding machine 30 used in this embodiment will be described. FIG. 2 is a side view of the grinding machine.

  The grinding machine 30 is an apparatus that grinds and removes the adhesive layer 21. As shown in FIG. 2, the grinding machine 30 is mounted on the machine body 31, a cutter 32 that is a grinding member installed below the machine body 31, and the machine body 31. An engine 33 as a rotating device, wheels 34, 34... As moving devices installed at four corners below the body 31, a handle 35 extending rearward from the upper part of the body 31, and a bracket 36 in front of the body 31 via a bracket 36. And an anti-adhesion material spraying device 37 supported by the

  The cutter 32 includes a disk-shaped rotating disk 32a and a bit 32b protruding from the lower surface of the rotating disk 32a. The cutter 32 is rotatably installed below the machine body 31 and is connected to the engine 33 via a rotating shaft (not shown). Moreover, the cutter 32 is attached so that raising / lowering is possible by the raising / lowering apparatus which is not shown in figure. Thereby, the grinding machine 30 can abut on and separate from the adhesive layer 21 while rotating the cutter 32 to grind the adhesive layer 21.

The adhesion preventing material spraying device 37 is attached to the spraying portion 37b from the storage portion 37a, a tank-shaped storage portion 37a for storing the adhesion preventing material 40, a cylindrical spraying portion 37b for spraying the stored adhesion preventing material 40. And a screw feeder 37c for transporting the prevention member 40. The spraying part 37b is disposed in the vicinity of the cutter 32 (more specifically, in front of the cutter 32) so that the adhesion preventing material 40 can be sprayed on the adhesive layer 21 around the cutter 32. The screw feeder 37c is configured to rotate at a desired rotational speed by the driving force of the engine 33. Thereby, the adhesion preventing material spraying device 37 can spray an appropriate amount of the adhesion preventing material 40 on the adhesive layer 21. Incidentally, application rates of anti-adhesion material ^{40, 100g / m 2 ~2000g / m} 2 is preferably about.

  The adhesion preventing material 40 adheres to the adhesive layer 21 and prevents the ground adhesive layer 21 from adhering to the cutter 32 and the steel deck 10 again. The adhesion preventing material 40 is preferably a granular or powdery material. Examples of the granular or powdery material include stone powder, sand, slag, slaked lime, and the like. The adhesion preventing material 40 may be configured by any one of these materials, or may be configured by combining them. The sand may be natural sand or artificial sand (crushed sand).

  Next, a method for removing asphalt pavement according to the present embodiment will be described with reference to FIG. FIG. 3 is an explanatory view showing the procedure of the asphalt pavement removal method, where (a) is a state where the asphalt mixture layer is removed, (b) is a state where the adhesive layer is ground, and (c) is a steel. The figure shows a state where the floor slab is being blasted.

  First, as shown in FIG. 3 (a), the asphalt mixture layer 22 is peeled off by the ripper R attached to the backhoe BH, loaded onto the truck DT, and carried out. The fine asphalt mixture layer 22 that could not be removed by the backhoe BH is removed using an electric pick (not shown). Thereby, the asphalt mixture layer 22 is removed.

  Next, as shown in FIG. 3B, the grinder 30 is installed on the adhesive layer 21, and the adhesion preventing material 40 is sprayed on the adhesive layer 21 using the adhesion preventing material spraying device 37. Then, the adhesive layer 21 is ground by bringing the cutter 32 into contact with the adhesive layer 21 on which the adhesion preventing material 40 has been spun while rotating. Thereby, the adhesive layer 21 is removed from the steel deck 10.

At this time, the adhesive layer 21 is softened (viscous) by friction with the cutter 32, but the spread adhesion preventing material 40 adheres to the softened adhesive layer 21, so that the adhesive layer 21 adheres to the cutter 32. Can be prevented. Therefore, it is possible to prevent the grinding ability of the grinding machine 30 from being lowered. Further, since the adhesion preventing material 40 is adhered to the ground adhesive layer 21, the adhesive layer 21 does not reattach to the steel deck 10. Therefore, the ground adhesive layer 21 can be easily collected and removed by, for example, a vacuum device.
Further, since the grinding machine 30 can precisely adjust the thickness to be ground, it is possible to easily remove only the adhesive layer 21 without damaging the steel deck 10.

  Next, as shown in FIG. 3C, the surface of the steel deck 10 is blasted using a shot blasting device 50 to remove foreign matters such as rust, dust, mud and oil. In addition, when performing a blast process, the surface of the steel deck 10 must usually be made into a dry state, but according to the removal method of the pavement using the grinding machine 30, the adhesion layer 21 is removed in a dry state. Since it can, blasting can be performed immediately. Therefore, while a construction period is shortened, adhesion between the newly constructed pavement and the steel deck 10 is improved, and construction quality is improved.

  As shown in FIG. 3C, the shot blasting device 50 is projected with a projection unit 51 that projects the blast material and sharpens the steel deck 10 and a cover 52 that prevents the blast material from scattering. A recovery unit 53 that recovers the blasting material and the removed foreign matter, and a separation unit 54 that separates the blasting material and the foreign matter. The shot blasting device 50 is connected to a vacuum device 56 via a hose 55 so as to collect the separated foreign matter such as rust and dust. The vacuum device 56 is mounted on, for example, a flat body track T so that it can move together with the shot blasting device 50.

  As described above, according to the method for removing a pavement according to the present embodiment, the adhesive layer 21 can be removed using the grinding machine 30, so that the work can be mechanized and the work efficiency can be improved. In addition, since work can be mechanized, uniform quality can be ensured and homogeneity can be improved.

  As mentioned above, although embodiment of this invention was described in detail with reference to drawings, this invention is not limited to this, In the range which does not deviate from the main point of invention, it can change suitably.

  For example, in the method for removing a pavement according to the present embodiment, the grinding machine 30 including the adhesion preventing material spraying device 37 is used. However, the present invention is not limited to this, and the adhesion preventing material 40 is manually sprayed. Alternatively, the adhesive layer 21 may be removed using a grinder (not shown) that does not include the adhesion preventing material spraying device 37. Even in such a method, the adhesive layer 21 can be ground with a grinding machine, so that the work can be mechanized and the work efficiency can be improved.

  Moreover, although the case where the asphalt pavement 20 was removed was demonstrated in this embodiment, as long as it has a structure which has an adhesive layer between a floor slab and a mixture layer, you may apply to concrete pavement. Even in such a case, the adhesive layer can be easily removed using a grinder.

  Moreover, in this embodiment, although the steel floor slab 10 was demonstrated as an example as a floor slab, it cannot be overemphasized that you may apply to the paving body constructed on the concrete floor slab. According to the present invention, the adhesive layer 21 can be removed by grinding without damaging the floor slab so much, so that it is particularly suitable when the floor slab is a steel slab.

(A) is sectional drawing of a steel deck and asphalt pavement, (b) is the elements on larger scale of the A section shown to (a). It is a side view of a grinding machine. It is explanatory drawing which shows the procedure of the removal method of asphalt pavement, (a) is the state which removed the asphalt mixture layer, (b) is the state which grinds the adhesion layer, (c) is blasting a steel deck The processing state is shown respectively.

Explanation of symbols

10 Steel floor slab (floor slab)
20 Asphalt pavement (pavement)
21 Adhesive layer 22 Asphalt mixture layer (mixture layer)
30 grinding machine 32 cutter (grinding material)
33 Engine (Rotating device)
34 Wheel (moving device)
37 Adhesion prevention material spraying device 37a Storage unit 37b Spraying unit 37c Screw feeder 40 Adhesion prevention material 50 Shot blasting device

Claims (7)

A method for removing a pavement formed by laminating an adhesive layer and a mixture layer in this order on a floor slab,
Removing the mixture layer;
Spraying an adhesion preventing material on the adhesive layer;
And a step of grinding the adhesive layer on which the adhesion preventing material has been dispersed by a grinding machine.   The method for removing a pavement according to claim 1, wherein the adhesion preventing material is a granular or powdery material.   The method for removing a pavement according to claim 1 or 2, wherein the adhesive layer is made of an asphalt adhesive.   The grinding machine includes a grinding member for grinding the adhesive layer, a rotating device for rotating the grinding member, a moving device for moving on the floor slab, and an adhesion for spreading the adhesion preventing material on the adhesive layer. The removal method of a pavement according to any one of claims 1 to 3, further comprising a prevention material spraying device.   The pavement according to any one of claims 1 to 4, wherein the floor slab is made of a steel slab, and includes a step of blasting the steel slab after grinding the adhesive layer. How to remove the body. A grinding machine used for removing a pavement formed by laminating an adhesive layer and a mixture layer in this order on a floor slab,
A grinding member for grinding the adhesive layer, a rotating device for rotating the grinding member, a moving device for moving on the floor slab, an adhesion preventing material spraying device for spraying an adhesion preventing material to the adhesive layer, A grinding machine comprising:   The adhesion preventing material spraying device includes a storage unit that stores the adhesion preventing material, a spraying unit that sprays the stored adhesion preventing material, and a screw feeder that conveys the adhesion preventing material from the storage unit to the spraying unit. And a grinding machine according to claim 6.

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